In regard to the different modes of painting the flesh, I belief it is
of little consequence which is pursued, if you only keep the colours
distinct; too much mixing makes them muddy and destroys their
brilliancy, you know. Sir Joshua was of opinion that the grey tints in
the flesh of Titian's pictures were obtained by scumbling cool tints
over warm ones; and others prefer commencing in a cool grey manner, and
leaving the greys for the middle tints, whilst they paint upon the
lights with warmer colours, also enriching the shadows with warmer and
deeper colours too. But for my own part, I have always thought it a good
way to consider the flesh as composed of different coloured network laid
over each other, as is really the case in nature, and may be seen by
those who will take the pains to look carefully into it.
_Northcote._